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Scienceware F371900001 Teflon (PTFE), Purple, Octagonal Spinfinity Magnetic Stir Bar, 3" Length, 0.5" Diameter

1 out of 5 stars 1 customer review

List Price: $35.95
Price: $27.89 & FREE Shipping on orders over $35. Details
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Only 7 left in stock (more on the way).
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  • Octagonal shape creates more turbulence and a stronger vortex than a round, cylindrical shape or a polygonal shape
  • Hard plastic casing provides more wear resistance than PTFE, for mixing abrasive solutions such as granular slurries
  • Built-in pivot ring helps reduce vibration and wear during stirring
  • Internal magnet made from alnico V, an alloy of aluminum, nickel, iron, and cobalt
  • Purple color for quick identification
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$27.89 & FREE Shipping on orders over $35. Details Only 7 left in stock (more on the way). Ships from and sold by Amazon.com.

Product Description

The Bel-Art Scienceware F371900001 Spinfinity octagonal-shaped stir bar with built-in pivot ring has a purple hard-plastic casing and an internal magnet made from alnico V (an alloy of aluminum, nickel, iron, and cobalt) for a range of laboratory stirring applications. The octagonal shape creates more turbulence and a stronger vortex than a round, cylindrical shape or a polygonal shape. The magnet sits inside a hard plastic casing that provides more wear resistance than polytetrafluoroethylene (PTFE), for mixing abrasive solutions such as granular slurries. A built-in pivot ring minimizes contact between the bar and the container to help reduce vibration and wear during stirring. Its purple color provides quick identification. The bar measures 3" (76.2 mm) by 0.5" (12.7 mm) (L x OD, where L is the length, the horizontal distance from left to right, and OD is the outside diameter, or the circumference). The casing material is FDA approved for use in food, drug, and cosmetic applications.

Magnetic stir bars (sometimes called stirring bars, spin bars, or fleas) are used to stir a liquid or solution in biological, chemical, medical, and research laboratory applications. The stir bar is placed inside a container of liquid or solution that is seated on a magnetic stirrer (also called a magnetic mixer), which is a laboratory device that creates a rotating magnetic field using a rotating magnet or multiple stationary electromagnets. The rotating magnetic field causes the bar to spin, which stirs the liquid or solution. Stirring bars are offered in a variety of sizes and shapes, and they are encased in materials such as glass or plastic to help prevent contamination of the liquid or solution, to reduce friction, and to provide resistance to chemicals, abrasion, and heat. The bar may have a pivot ring or pivot point to minimize contact with the container, reduce friction, and improve its spinning. The size and shape of the container and the volume and viscosity of the liquid or solution to be stirred determine which stir bar shape, size, and casing will suit a particular application.

Bel-Art Products manufactures scientific products, including labware, testing equipment, and safety supplies, under the Bel-Art and Scienceware brands. The company, founded in 1946, is headquartered in Wayne, NJ.


Product Information

Technical Details

Brand Name Bel-Art Products
Item Weight 1.1 pounds
Product Dimensions 4.5 x 4.5 x 3 inches
Item model number 371900001
Color Purple
Shape Octagon
Material Type PTFE (Polytetrafluoroethylene)
Number of Items 1
Size 3" x 1/2"
Manufacturer Part Number 371900001

Additional Information

ASIN B002VBW7AW
Customer Reviews
1 out of 5 stars 1 customer review

1 out of 5 stars
Best Sellers Rank #413,537 in Office Products (See top 100)
#248 in Industrial & Scientific > Lab & Scientific Products > Lab Instruments & Equipment > Mixing & Blending Equipment > Stirrers, Mixers & Accessories > Magnetic Stir Bars
#381 in Industrial & Scientific > Lab & Scientific Products > Lab Instruments & Equipment > Mixing & Blending Equipment > Stirrers, Mixers & Accessories > Magnetic Stirrers
Shipping Weight 1.1 pounds (View shipping rates and policies)
Domestic Shipping This item is also available for shipping to select countries outside the U.S.
International Shipping This item can be shipped to select countries outside of the U.S. Learn More
Date First Available November 3, 2009

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Hot sodium hydroxide ate away at the plastic casing on first usage. Now it looks like someone took a soldering iron to it. It was in boiling water, so it was never much hotter than 212*F. This thing is not as inert as it should be.
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Scienceware F371900001 Teflon (PTFE), Purple, Octagonal Spinfinity Magnetic Stir Bar, 3" Length, 0.5" Diameter
This item: Scienceware F371900001 Teflon (PTFE), Purple, Octagonal Spinfinity Magnetic Stir Bar, 3" Length, 0.5" Diameter
Price: $27.89
Ships from and sold by Amazon.com
Want to discover more products? Check out these pages to see more: lab equipment, magnetic stir bar